Means for assembling cores of dynamo-electric machines.



E. R. KNIGHT. MEANS FOR ASSBMBLING COREE OF DYNAMC ELECTRIC MACHINES.

APPLICATION FILED NOV. 30, 1910A Patented Mar. 24, 1914 E. R. KNIGHT.

MEANS FOR ASSEMBLNG GORES 0F DYNAMO ELECTRIC MACHINES.

` APPLICATION FILED Nov. 3o, 1910.

1,090,920. Patented Mar. 24, 19m

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MEANS POR ASSEMBLING GOEES OE DYNAMO ELECTRIC MACHINES.

APPLICATION FILED Nov. 30, 1910.

1,090,920. Patented Mar.24,1914.

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1,090,920. Patented Mar. 24, 1914,

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UNITED STATES PATENT OFFICE.

EARLE R. KNIGHT, OF NORWOOD, OHIO, ASSIGNOR, BY MESNE ASSIGNMENTS, TO ALLIS-CHA'LMERS MANUFACTURING COMPANY, A CORPORATION OF DELAWARE.

MEANS FOR ASSEMBLING CORES- OF DYNAMO-ELECTRIC MACHINES.

Application filed November 30, 1510.

To all ttf/0m it may concern Be it known that I, EARLE R. KNIGHT, a citizen of the United States, residing at Norwood, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Means for Assembling Cores of Dynamo-Electric Machines, of which the following is a full, clear, and exact specification.

This invention relates to means for assembling cores of electrical apparatus, particular attention being directed to dynamoelectric machines.

The accurate and reliable assembling of cores of dynamo-electric machines and other electrical apparatus is a problem of no little moment. If the laminated core is built up piece by piece within the core, said core when completely assembled, unless a great deal of valuable time has been used, will present rough surfaces. Some of the lamina) may project beyond others both radially and circumferentially. Again, when laminated cores are pressed as units into yokes of machines, there is a tendency for the laminas to drift. This means that slots for receiving the coils of windings will not be properly alined. The slots may be skewed and the sharp edges of laminze extend into the slots. At best, it would be necessary to le or remove the projecting edges of laminze to prevent such laminas from piercing through the insulation around the coils and short circuit or grounding the winding. The machine would thereby be rendered useless. By filing the laminaa after the core is assembled the burred edges of one laminas come into contact with adjacent laminze and the line filings sift in between the laminee forming a continuous path for eddy currents. The eddy current loss occasioned by such practice is surprisingly large and necessarily decreases the efiiciency of the machine. Again, too much time is spent ordinarily in the assembling of cores of dynamo-electric machines and other electrical apparatus.

In view of the above, it is the object of this invention to provide novel, useful, simple and inexpensive methods of and means for assembling cores of electrical apparatus.

The various novel features of my invention will be described in the specification and particularly set forth in the appended claims.

Specification of Letters Patent.

Patented Mar. 24, 1914.

Serial No. 594,813.

My invention is illustrated in the accompanying sheets of drawings, in which- Figure 1 is a vertical sectional view of one of my machines for pressing cores into the yokes of a dynamo-electric machine, this machine being particularly useful in the assembling of cores for small dynamo-electric machines; Fig. 2 is a view partly in section taken along the line 2 2 of Fig. 1, looking 1n the direction indicated by the arrows; Fig. 3 is a vertical sectional view of the same machine after the core has been pressed into the yoke of a dynamo-electric machine; Fig. 4 is a similar view with the mandrel removed after the core has been pressed into the yoke of a dynamo-electric machine; Fig. 5 is a vertical sectional view of a machine of the same general character as that shown in Fig. 1, but in this case the machine is pneumatically operated and is especially adapted for assembling cores for comparatively large dynamo-electric machines; Fig. 6 is a top elevation of that shown in Fig. 5; Fig. 7 is a vertical sectional view of a pneumatically operated machine after it has pressed the laminated core into the yoke of the dynamoelectric machine; Fig. 8 is a longitudinal sectional view of a stator of a. dynamo-electric machine with the mandrel still fastened within the core; and, Fig. 9 is a vertical sectional view of the core assembling machine with the mandrel removed from the core structure after the core has been pressed into the yoke.

One of the machines, the one which is particularly adapted for assembling cores of small dynamo-electric machines, has an annular base 10, which is supported by three integrally formed legs 11, 12, and 18. This base is provided with an annular opening 14 through which a guide 15 is adapted to slide. Secured by bolts 16 to a ring 15a which engages an inside shoulder portion 15b of the guide 15 is a mandrel 17 through which passes a shaft or movable member 18 having a threaded portion. 19 by means of which motion is transmitted to said mandrel and guide. A laminated core 20, to be pressed into electrical apparatus, is formed about the mandrel and is held between two comparatively heavy metal plates 21 and 22, the latter of which rests upon the upper portio-n of the guide 15 and the former metal plate 21 of which is pressed against the core by a cap 23. This cap is held against the plate 21 by a nut 24 engaging a threaded portion 25 of the shaft 18, said nut bearing down upon a collar 2G, which is interposed between the nut 24 and the cap 23. The

base 10 is provided with a flat surface upon' which the yoke 27 of a dynamo-electric machine may be placed preparatory to having the core 2O pressed into it.

The mechanism for actuating the guide 15, mandrel 17 with the core 20 secured thereto, comprises a hand wheel 28 having a threaded portion which engages thethreaded portion 19 of the shaft 18. Secured to this hand wheel is a gear wheel 29 also engaging the threaded port-ion 19 of the shaft 18. The gear 29 meshes with another gear wheel 30 which is provided with a shaft 31, motion to which is transmitted through a universal joint 32, shaft 33, from handle 34. The shaft 33 passes through a lug 35 formed integral with one of the legs 12. The shaft 31 passes through a plate 35a which is secured to the legs 11, 12, and 13 by bolts 36 and engages shoulder portions 37 of said legs to prevent the upward movement of the plate 35a when the hand wheel 28 is turned for actuating the shaft 18. Another member 39 is secured to the legs 11, 12. and 13 by bolts 40 and also to the plate 35a by bolts 41. This member 39 forms asupport for the hand wheel 28 and gear wheel 29, said hand and gear wheels being interposed between the plate 35a and member 39.

After the yoke 27 of a dynamo-electric machine has been placed upon the base 10 and the core 2O has been mounted upon the mandrel and initially compressed a slight amount by nut 24, the handle 34 is rotated to draw down the shaft 18 with the guide, mandrel, and core until the core has reached the top of the yoke. At this point the hand wheel 28 is rotated gradually drawing the core 2O into the yoke 27. After the core is pressed completely into the yoke, the metal plate 21 being forced down below a groove 42 formed in the yoke, a split retaining ring 43 is placed in said groove for retaining the laminated core in its proper position, the other metal plate 22 being forced against a shoulder 43a of the yoke. At this point the nut 24 may be screwed off the shaft 18 and the collar 2G land cap 23 also removed from the shaft. The cap 23 is provided with handles 44 so that the cap may be removed without any particular difficulty. After the cap has been removed the collar 26 and nut 24 may be again placed on the shaft 18 with the collar` engaging the upper surface of the mandrel 17. By turning the hand wheel again in the same direction the mandrel 15 will be drawn out of the laminated core 20 and the` stator yoke in its complete form, provided it has been properly machined in the rst place, is ready to receive its winding. If it is desired to bore or machine the stator after the core has been pressed into the yoke, a suitable mandrel may be used for that purpose and be kept in the core structure until the machine has been completed. Such an arrangement will be considered in the pneumatically operated machine to be referred to presently.

By referring to Figs. 1, 3, and 4, the dit'- ferent stages of assembling laminated cores in the yokes may be seen, Fig. 1 showing the core preparatory to being pressed in the yoke, Fig. 3 showing the core pressed into the yoke, and Fig. 4 showing the core pressed into the yoke and the mandrel removed from the core. The handle 34 is used only for giving the shaft a rapid movement and is adapted only for light work, while the hand wheel 28 is used for the heavy work of pressing cores into the yokes.

This manually operated core assembling machine is more particularly adapted for assembling cores of comparatively small dynamo-electric machines. For the purpose of pressing cores into comparatively large dynaine-electric machines, I have provided a machine which is operated pneumatically and which is illustrated in Figs. 5 to 9 inelusive. I do not limit myself to pneumatically operated machines, for hydraulic, steam-operated, or any power operated machine can be used. The base 45 of this pneumatically operated machine or device is provided with three legs 46, 47, and 48 which are secured to any suitable foundation by foundation bolts 50. This base 45 has a bored portion 4721 in which a guide 48@L is adapted to slide. This guide is provided with a groove which receives a feather 49 for keeping said guide from turning. The base 45 is adapted to support a yoke 51 of a dynamo-electric machine adapted to receive a laminated core 52 which is mounted on a mandrel 53 having a hub 54. A threaded stem 55 passes through the hub 54 and en gages a shaft 5G to which the guide 48 is secured. A nut 57 engaging the stem presses down on the hub 54 of the mandrel which includes an annular member 58 bolted to the main portion of the mandrel. Secured to a Hang-ed portion 59 of the mandrel are steel plates GO which may have any thickness and curvature to be used in connection with any particular core. These steel plates are arranged circumferentially of the mandrel and occur alternately with the bolts G1 which hold the plate 58 against the laminated core. The lower end of the shaft or movable member 5G is provided with a piston 62 which is adapted to move in a cylinder G3 having end heads G4 and G5. The cylinder is secured to the base 45 by bolts G6. The cylinder 63 is provided with ports G7 and G8 for the reception and eX- pulsion of a fluid to be used for actuating the piston. The cylinder is connected to a iiuid source G9 through Valves 70 and 7l which control the admission and exhaust oiI tluid into and from the cylinder (i3. The valve 70 is connected to the source of fluid supply by a pipe 72, to the upper end of the cylinder ($3 by pipe 73, and to an exhaust pipe 741. Likewise valve 71 is connect ed to the source by a pipe 75 to the lower end of the cylinder ('33 by pipe 76, and to an exhaust pipe 77.

When the yoke 51 is properly placed on the base 415 and the laminated core 52 mounted on the mandrel 53, valve 70 is operated to permit a flow oiiiiuid through pipe 73 into the upper end of the cylinder G3, forcing the piston G2 downwardly and drawing the core 52 into the yoke 5l. When the core has been drawn in the yoke 51 to the point where it engages the retaining ring 7 8, the upper portion of the core is pressed beyond the groove 7 9 in which is then placed another retaining ring 8O for holding the core in a fixed position. rChe machine in this position is illustrated in Fig.V 7. The nut 57 may now be removed and the yoke with its laminated core having the mandrel still located within the core be mounted upon a boring machine to properly machine the yoke. The yoke, core, and mandrel are then brought back as a unit and again placed on the base ot the assembling machine and the stem 55 passed through the hub of the mandrel. rIhe nut 57 is then again screwed down tightly upon the hub of the mandrel and the valve 7 0 is operated to pass more fluid through the pipe 73 to the upper part ot the cylinder G3 to force the piston downward until the mandrel is completely removed from the core as shown in Fig. 9. The stator is now ready to be wound. The valves and 71 can now be operated so that tluid may pass'through the pipe 7G .forcing the piston 62 upwardly and permitting the exhaust luid to be forced out of pipes 73 and 74;. By using a pneumatic machine such ashere disclosed, any required power may be obtained for forcing cores of any size into yokes of dynamo-electric machines.

It is not intended to claim in this application the methods of assembling` cores involved in the use ot' the apparatus described above, the same being claimed in applicants co-pending application. Serial No. 805.109, tiled December 11, 1918, which is a division of this application.

There may be many modifications ot the precise forms and arrangements herein shown and described, and I intend to cover all such modifications which do not involve a departure from the scope or" my invention as set forth in the appended claims.

Vilhat I claim as new is 1. In a device tor assembling a core ot a dynamo-electric machine, means upon which to Jform and support a core, and means for moving and pressing said core as a unit into said machine.

2. In a device for assembling cores of dynamo-electric machines, a movable mem ber for forming and supporting a core, and means for actuating said movable memberfor pressing said core into said machine.

3. In a device for assembling a core of a dynamo-electric machine, a member upon which to form and support a core and adapted to be moved axially ot said machine, and means for actuating said member for press ing said core into said machine.

ll. In a device for assembling a core ot a dynamdelectric machine, a movable member upon which to form and support a core, means for actuating said movable member for pressing said core into said machine, and means for guiding the movement of said member.

5. In a device for assembling a core of a dynamo-electric machine, a member having a base adapted to support the yoke of said machine, means movable through said base for supporting a core, and means for forcing said core into the yoke ot said machine.

G. In a device tor assembling a core oit a dynamo-electric machine, a movable mandrel adapted to support a core, and means for actuating said mandrel to torce the core into the yoke ot said machine.

7. In a device for assembling a core o'li a dynamo-electric machine, means for supporting a core, and means for forcing' said core into theyoke of said dynamo-electric machine and for then removing said supportin means trom said core by a continued movement in the same direction.

8. In a device for assembling a core in a dynamo-electric machine` a movable memler, means mounted on said movable member for forming and supporting a core., means mounted on said movable member 'for guidine` its movement. and means for actuating said movable member to press said core into the yoke of said dynamo-electric machine.

9. In a device for assembling a core or" a dvnamo-electric machine. a member provided with a bore. a guiding member adapted to .slide in said bore, a movable member carrying` said guiding member. means mounted on said movable member and adapted to receive a core, and means for actuating said movable member to force said core into the yoke of said dynamo-electric machine.

10. In a device for assembling a core of a dynamo-electric machine, means for supporting a core, and power operated means for actuating said supporting means for forcing said core into said machine and for then removing said supporting means from said core by a further movement.

11. In a device for assembling a core of a Cit dynamo-electric machine, a member for forming and supporting the co-re and adapted to be moved axially of said machine, and pneumatically operated means for actuating said movable member for forcing said core into said machine.

12. In a device for assembling a core of a dynamo-electric machine, a movable member for forming and supporting a core, neans for guiding the movement of said member', and power operated means for forcing said core into the yoke of said machine.

In a. device for assembling a core of a dynamo-electric machine, a member adapted to form and support a core, movable guiding means connected to said member, and power operated means for forcing said core into the yoke of said dynamo-electric machine, said power operated means being adapted to effectively actuate said member in a plurality of directions.

14:. In a device for assembling a core of a dynamo-electric machine, a member adapted to support a. yoke and having a bored portion, movable means adapted to support a core, pneumatically operated means for actuating said movable member to force said core into the yoke of said dynamo-electric machine, and means within the yoke supporting member and associated with the bored portion for guiding said movable means.

15. In a device for assembling a core of a dynan'io-electric machine, the combination of a movable member for supporting a core, a pressure receiving member associated with said movable member, and power operated means for actuatingv said movable member to force said core into the yoke of said dynamoelectric machine and also to remove said supporting member from said core by a further movement in the same direction.

1G. In a device for assembling a core of a dynamo-electric machine, a movable member adapted to support a core, means separated from and movable with said movable member for guiding it, a iiuid receiving member, and pneumatically operated means within said receiving member and associated with said movable member for forcing said core into the yoke of said dynamo-electric machine.

17. In a device for assembling a core of a dynamo-electric machine, a movable member adapted to support a core, means for guiding the movement of said movable member, a lluid receiving member, and a power operated member located in said fluid receiving member and associated with said movable member for forcing said core into the yoke of said dynamo-electric machine and also to remove said supporting member from said core by a further movement in the same direction.

1S. In a device for assembling cores of electrical apparatus, a movable member adapted to form and support a core, a fluid receiving member having receiving and exhaust ports, power operated means located in said Huid receiving member and associated with said movable member for forcing said core into said el ctrical apparatus, iiuid being forced out of the exhaust port while fluid enters the other port.

19. A device for assembling cores of electrical apparatus, a member adapted to support the frame of said apparatus, a movable member movable through said frame supporting member and adapted to support a core of said electrical apparatus, a fluid receiving` chamber, and pneumatically operated means located in said chamber and associated with said movable member for forcing said core into the frame of said electrical apparatus.

20. In a device for assembling a core of a dynamo-electric machine, means adapted to support the yoke of a dynamo-electric machine, a movable member movable through said yoke supporting` means and adapted to support a core, a cylinder, a piston slidablv mounted in said cylinder and associated with said movable member for forcing said core into the yoke of said dynamo-electric machine.

21. In a device for assembling a core of a dynamo-electric machine, a core former and support, power operated means for actuating said support to force said core into the yoke of said dynamo-electric machine, and means remote from said device for controlling the operation of said power operated means.

Q2. ln a device for assembling a core of a dynamo-electric machine, means for supporting a core, power operated means for successively forcing said core into the yoke of said dynamo-electric machine and removing` said supporting means from said core while moving in the same direction, and means for controlling the operation of said power operated means.

Milwaukee, IVis., Nov. Q2, 1910.

In testimony whereof I a'HiX my signature, in the presence of two witnesses.

EARLE R. KNIGHT.

lWitnesses G. M. Hnvrfr, H. F. THOMPSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

